<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  </head>
  <body>
    <style>
      div[id='hd'] {
        color: red;
      }
    </style>
    <div id="hd" title class>houdunren.com</div>
    <div id="houdunren" class>houdunren.com</div>
  </body>
</html>
